[Bug 1847628] Re: When using swap in ZFS, system stops when you start using swap

[Brian Murray]

** Also affects: ubuntu-release-notes
   Importance: Undecided
       Status: New

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Title:
  When using swap in ZFS, system stops when you start using swap

Status in Release Notes for Ubuntu:
  New
Status in Native ZFS for Linux:
  Unknown
Status in ubiquity package in Ubuntu:
  Confirmed
Status in zfs-linux package in Ubuntu:
  Confirmed

Bug description:
  # Problem

  When using swap in ZFS, system stops when you start using swap.

  > stress --vm 100

  if you doing swapoff will only occur OOM and the system will not stop.

  # Environment

  jehos at MacBuntu:~$ lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu Eoan Ermine (development branch)
  Release:        19.10
  Codename:       eoan

  jehos at MacBuntu:~$ dpkg -l | grep zfs
  ii  libzfs2linux                               0.8.1-1ubuntu13                     amd64        OpenZFS filesystem library for Linux
  ii  zfs-initramfs                              0.8.1-1ubuntu13                     amd64        OpenZFS root filesystem capabilities for Linux - initramfs
  ii  zfs-zed                                    0.8.1-1ubuntu13                     amd64        OpenZFS Event Daemon
  ii  zfsutils-linux                             0.8.1-1ubuntu13                     amd64        command-line tools to manage OpenZFS filesystems

  jehos at MacBuntu:~$ uname -a
  Linux MacBuntu 5.3.0-13-generic #14-Ubuntu SMP Tue Sep 24 02:46:08 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

  jehos at MacBuntu:~$ zpool list
  NAME    SIZE  ALLOC   FREE  CKPOINT  EXPANDSZ   FRAG    CAP  DEDUP    HEALTH  ALTROOT
  bpool  1.88G  66.1M  1.81G        -         -      -     3%  1.00x    ONLINE  -
  rpool   230G   124G   106G        -         -     9%    53%  1.00x    ONLINE  -

  jehos at MacBuntu:~$ zfs get all rpool/swap
  NAME        PROPERTY              VALUE                    SOURCE
  rpool/swap  type                  volume                   -
  rpool/swap  creation              목 10월 10 15:56 2019  -
  rpool/swap  used                  2.13G                    -
  rpool/swap  available             98.9G                    -
  rpool/swap  referenced            72K                      -
  rpool/swap  compressratio         1.11x                    -
  rpool/swap  reservation           none                     default
  rpool/swap  volsize               2G                       local
  rpool/swap  volblocksize          4K                       -
  rpool/swap  checksum              on                       default
  rpool/swap  compression           zle                      local
  rpool/swap  readonly              off                      default
  rpool/swap  createtxg             34                       -
  rpool/swap  copies                1                        default
  rpool/swap  refreservation        2.13G                    local
  rpool/swap  guid                  18209330213704683244     -
  rpool/swap  primarycache          metadata                 local
  rpool/swap  secondarycache        none                     local
  rpool/swap  usedbysnapshots       0B                       -
  rpool/swap  usedbydataset         72K                      -
  rpool/swap  usedbychildren        0B                       -
  rpool/swap  usedbyrefreservation  2.13G                    -
  rpool/swap  logbias               throughput               local
  rpool/swap  objsetid              393                      -
  rpool/swap  dedup                 off                      default
  rpool/swap  mlslabel              none                     default
  rpool/swap  sync                  always                   local
  rpool/swap  refcompressratio      1.11x                    -
  rpool/swap  written               72K                      -
  rpool/swap  logicalused           40K                      -
  rpool/swap  logicalreferenced     40K                      -
  rpool/swap  volmode               default                  default
  rpool/swap  snapshot_limit        none                     default
  rpool/swap  snapshot_count        none                     default
  rpool/swap  snapdev               hidden                   default
  rpool/swap  context               none                     default
  rpool/swap  fscontext             none                     default
  rpool/swap  defcontext            none                     default
  rpool/swap  rootcontext           none                     default
  rpool/swap  redundant_metadata    all                      default
  rpool/swap  encryption            off                      default
  rpool/swap  keylocation           none                     default
  rpool/swap  keyformat             none                     default
  rpool/swap  pbkdf2iters           0                        default

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